Device for ascertaining the thread tension on embroidery-machine shuttles



K. BURRI AND F. SUMMER. DEVICE FOR ASCERTAINING THE THREAD TENSION 0NEMBROIDERY MACHINE SHUTTLES.

APPLICATION FILED AUG. 3. 1920.

1,363,835, Patented Dec. 28,1920.

UNITED STAT ES\'PA 'IENT OFFICE.-

KONRAD BURRI, OF HERISAU, AND FRIEDRICH SOMMER, OF ARBON, SWITZERLAND.

DEVICE FOR ASCER'IAINING THE THREAD TENSION ON EMBROIDERY-MACHINESHUTTLES.

. Application filed August 3,

To all whom it may concern:

Be it known that we, KoNRAD BURRI and FRIEDRICH SOMMER, citizens of theRepubllo of Switzerland, residing at Herisau and at Arbon, Switzerland,have invented certaln new and useful- Improvements in a Dev1ce forascertaining the Thread Tension on Embroidery-Machine Shuttles, of whichthe following is a specification.

The object of the invention herein described is a device or contrivancefor ascertaining the thread tension on embroidery machine shuttles. Thecontrivance exhlblts two falling weights freed by a common releasingmechanism, of which the one welght is brought into connection with theend of a thread clipped or broken from a thread of the shuttle and drawsit out of the same in its fall, and the other of which, after travelinga pre-determined length of drop, limits further drop of the first weightfor the time being in such a manner that the tension of the thread canbe numerically established from the length of way traveled by the firstweight.

The invention is illustrated on the annexed plan or design, andexhibits:

Figure 1 front view,

Fig. 2 transverse section of the contrivance, and t Fig. section to theline E--F of F g. 2.

Fig. (1) is a body or frame on (111611 a rail (2) is vertically situatedand easlly displaceable. Above, on the body (1) there is a shuttle bed(3) on which the shuttle is placed. Further, the rail (2) is providedwith a thread-clamping device consistingof the two clamps (4:) and (5),together with the spring (6) supported on a bolt. An arm or bearer (7 ismounted on pivot points on the frame (1) with an adjustable weight (8),the latter being attached to a lever or rod (15) provided at its endwith a screw and screwed into the arm (7). A rod (9) with upwarddirection is screwed into the arm (7 and bent or curved at the top, thecurved end entering a weighted and turnable releasing hook (10), themovement of which is limited by a forked stop (11). The releasing hook(10) is provided with a handle (12). polnter or index attached to therall (2) is supported by the curved end of the rod The latter thusprevents the rail (2) from falling when it is in this upper position. A

i Specification of Letters Patent.

Patented Dec. 28, 1920.

1920. Serial No. 401,019.

longitudinal slot or notch (14:) is in the lower part of the rail(2),and, attached to or formed on the lower end of the lever or rod (15), is a wedge-shaped nose (15) that enters the slot 14% when lever 15rotates on its pivot. The device or contrivance operates in thefollowing manner :The handle (12) is pressed down, so that (Fig. 2) therighthand part of the releasing-hook 10 comes against the lower stop offork 11). The weight (8) in its fall draws the curved or bent end of therod (9) over the hook (10) and thus releases the support of the rail(2), 2'. e. the pointer (13); hence the rail is borne down by its ownweight and, in moving down pulls the end of the thread clamped betweenthe tighteners or clamps (at) and (5) out of the shuttle. As soon as theweight (8) has traveled a certain length of way, the nose (15) on thelower end of the rod (15) moves into the longitudinal notch (14-) of therail (2). By this means both the rail and the weight (8) are preventedfrom further falling. The tension of the thread on the length of waytraveled by the rail (2) can then be numerically established by readingthe scale (16).

Having now particularly described and ascertained the nature of our saidinvention and in what manner the same is to be performed, we declarethat what we claim is 1. In a device for testing the threads ofembroidery shuttles which comprises a support for the shuttles, a weightattached to the shuttle thread, a second weight mounted to arrest thefall of the first weight after a predetermined length of time and meanscommon to both weights to simultaneously hold the weights and to releasethem.

2. In a device for testing the thread of embroidery shuttles, a shuttlesupport, a vertically movable rail having a slot therein, a pivotedweight having means for entering said slot and arresting said rail, andmeans for attaching a shuttle thread to said rail, a scale forindicating the length of drop of said rail and means for holding andreleasing the weights.

3. In a device for testing the thread of embroidery shuttles, a frame, ashuttle support on said frame, and vertically slidable rail thereinhaving a slot at its lower end,

a pivoted lever, a weight adjustable on said lever, the lower end ofsaid lever arranged to enter said slot and arrest saidrail,

ill)

a scale on the frame, an index on said rail and means for simultaneouslyholding and releasing said rail and weighted lever.

A device for testing the thread of embroidery shuttles, Which comprisesa frame, a shuttle support on said frame, a vertically slidable railmounted in said frame, means on the rail for securing the end of ashuttle thread, a pivoted lever, a weight adjustable on said lever, thelower end of said lever arranged to engage and arrest the fall of saidrail, a scale on said frame, an indicator on said rail movable alongsaid scale, means for simultaneously holding the rail and lever inraised position and for simultaneously releasing them. 7

5. In a device for testing the thread of embroidery shuttles, a frame,a"rail vertically movable in said frame a lever pivoted on the frame andarranged to arrest the fall of said rail, a shuttle support on theframe, means on the rail to hold the end of a shuttle thread, an indexon the rail, a rod on said lever capable of extending under said indexwhen rail and lever are in raised position, and a pivoted hook engagingthe end of' said rod, whereby when said hook is released said rod willmove from under said index and the rail and lever be simultaneouslyreleased.

In testimony whereof We affix our signatures in presence of twoWitnesses.

KONRAD BURRI. FRIEDRICH SOMMER.

